C/2017 E3 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2017 E3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-06-06T23:41:41.795520Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
620 |
| NEO |
- |
| M1 |
5.700 |
| K1 |
10.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-03-26.0000000 |
| e |
1.01291206 |
| q (au) |
5.926129 |
| a (au) |
-458.960808 |
| i (deg) |
70.717015 |
| Ω (om, deg) |
220.742632 |
| ω (w, deg) |
334.279194 |
| M (ma, deg) |
0.029271 |
等級
散乱 + 全体線形
$$
M_a = (5.638 + 3.939\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.638 |
| n |
3.939 |
| gf |
0.887 |
| gb |
-0.947 |
| k |
1.000 |
| δ90 |
6.116 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
19:11:37.19 |
+46:31:32.7 |
HIP 94335 |
13.01 |
| 2026-02-03 12:00 |
19:11:46.26 |
+46:32:22.2 |
HIP 94335 |
13.32 |
| 2026-02-04 00:00 |
19:11:55.29 |
+46:33:12.3 |
HIP 94335 |
13.86 |
| 2026-02-04 12:00 |
19:12:04.30 |
+46:34:03.0 |
HIP 94335 |
14.61 |
| 2026-02-05 00:00 |
19:12:13.27 |
+46:34:54.3 |
HIP 94335 |
15.53 |
| 2026-02-05 12:00 |
19:12:22.21 |
+46:35:46.2 |
HIP 94335 |
16.60 |
| 2026-02-06 00:00 |
19:12:31.12 |
+46:36:38.6 |
HIP 94335 |
17.79 |
| 2026-02-06 12:00 |
19:12:39.99 |
+46:37:31.6 |
HIP 94335 |
19.07 |
| 2026-02-07 00:00 |
19:12:48.83 |
+46:38:25.1 |
HIP 94335 |
20.43 |
| 2026-02-07 12:00 |
19:12:57.63 |
+46:39:19.2 |
HIP 94438 |
19.85 |
| 2026-02-08 00:00 |
19:13:06.40 |
+46:40:13.9 |
HIP 94438 |
18.76 |
| 2026-02-08 12:00 |
19:13:15.13 |
+46:41:09.1 |
HIP 94438 |
17.78 |
| 2026-02-09 00:00 |
19:13:23.82 |
+46:42:04.9 |
HIP 94438 |
16.91 |
| 2026-02-09 12:00 |
19:13:32.47 |
+46:43:01.2 |
HIP 94438 |
16.17 |
| 2026-02-10 00:00 |
19:13:41.09 |
+46:43:58.1 |
HIP 94438 |
15.59 |
| 2026-02-10 12:00 |
19:13:49.67 |
+46:44:55.5 |
HIP 94438 |
15.17 |
| 2026-02-11 00:00 |
19:13:58.21 |
+46:45:53.5 |
HIP 94438 |
14.94 |
| 2026-02-11 12:00 |
19:14:06.71 |
+46:46:52.0 |
HIP 94438 |
14.90 |
| 2026-02-12 00:00 |
19:14:15.17 |
+46:47:51.0 |
HIP 94438 |
15.06 |
| 2026-02-12 12:00 |
19:14:23.59 |
+46:48:50.6 |
HIP 94438 |
15.40 |
| 2026-02-13 00:00 |
19:14:31.98 |
+46:49:50.7 |
HIP 94438 |
15.91 |
| 2026-02-13 12:00 |
19:14:40.31 |
+46:50:51.3 |
HIP 94438 |
16.58 |
| 2026-02-14 00:00 |
19:14:48.61 |
+46:51:52.4 |
HIP 94675 |
16.32 |
| 2026-02-14 12:00 |
19:14:56.87 |
+46:52:54.1 |
HIP 94675 |
14.61 |
| 2026-02-15 00:00 |
19:15:05.08 |
+46:53:56.3 |
HIP 94675 |
12.90 |
| 2026-02-15 12:00 |
19:15:13.25 |
+46:54:59.0 |
HIP 94675 |
11.20 |
| 2026-02-16 00:00 |
19:15:21.38 |
+46:56:02.1 |
HIP 94675 |
9.52 |
| 2026-02-16 12:00 |
19:15:29.46 |
+46:57:05.8 |
HIP 94675 |
7.86 |
| 2026-02-17 00:00 |
19:15:37.49 |
+46:58:10.0 |
HIP 94675 |
6.24 |
| 2026-02-17 12:00 |
19:15:45.49 |
+46:59:14.7 |
HIP 94675 |
4.70 |
| 2026-02-18 00:00 |
19:15:53.43 |
+47:00:19.9 |
HIP 94675 |
3.35 |
| 2026-02-18 12:00 |
19:16:01.33 |
+47:01:25.6 |
HIP 94675 |
2.52 |
| 2026-02-19 00:00 |
19:16:09.19 |
+47:02:31.7 |
HIP 94675 |
2.72 |
| 2026-02-19 12:00 |
19:16:16.99 |
+47:03:38.3 |
HIP 94701 |
1.83 |
| 2026-02-20 00:00 |
19:16:24.75 |
+47:04:45.4 |
HIP 94701 |
2.24 |
| 2026-02-20 12:00 |
19:16:32.46 |
+47:05:53.0 |
HIP 94701 |
3.56 |
| 2026-02-21 00:00 |
19:16:40.13 |
+47:07:01.0 |
HIP 94758 |
4.43 |
| 2026-02-21 12:00 |
19:16:47.74 |
+47:08:09.5 |
HIP 94758 |
2.88 |
| 2026-02-22 00:00 |
19:16:55.30 |
+47:09:18.5 |
HIP 94758 |
1.70 |
| 2026-02-22 12:00 |
19:17:02.82 |
+47:10:27.9 |
HIP 94758 |
1.84 |
| 2026-02-23 00:00 |
19:17:10.28 |
+47:11:37.7 |
HIP 94758 |
3.13 |
| 2026-02-23 12:00 |
19:17:17.70 |
+47:12:48.0 |
HIP 94758 |
4.70 |
| 2026-02-24 00:00 |
19:17:25.06 |
+47:13:58.7 |
HIP 94758 |
6.34 |